147 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 147 years old now, what year was he born? See below:

If 147 years old, year of birth is:
1877 or 1878*

*It depends on whether he was born before or after 1 January 1878.

If now 147 years and his year of birth 1877 if he was born after 16 January 1877 until 31 december 1877 inclusively, and his year of birth is 1878 if he was born from 1 January 1878 to 16 January 1878.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 12 years, year of birth 2012 or 2013
If now 23 years, year of birth 2001 or 2002
If now 43 years, year of birth 1981 or 1982

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